On Apr 21, 2010, at 3:26 PM, Roger Marquis wrote:
William Herrin wrote:
Not to take issue with either statement in particular, but I think there needs to be some consideration of what "fail" means.
Fail means that an inexperienced admin drops a router in place of the firewall to work around a priority problem while the senior engineer is on vacation. With NAT protecting unroutable addresses, that failure mode fails closed.
In addition to fail-closed NAT also means:
* search engines and and connectivity providers cannot (easily) differentiate and/or monitor your internal hosts, and
Right, because nobody has figured out Javascript and Cookies.
* multiple routes do not have to be announced or otherwise accommodated by internal re-addressing.
I fail to see how NAT even affects this in a properly structured network. Owen